Only commenting on this as it's about the gears. Mine struggles to get into 2nd gear, very often I have to go back into neutral &I try again. It's worse when cars and engines cold but still quite common when warmed up. Is this common issue?
What size bolt holds the gear knob on ? I'm looking at converting my Fiat Idea to take the 500 Gear knobs so would need to tap and drill the bolt hole.